Aviator&#39;s level.



A. MORRIS.

AVIATORS LEVEL. APPLICATION FILED MAY 31. 191B.

Patented Nov. 12 1918.

. falling.

UNITED STAN ANDREW MORRIS, VANCOUVER, BRITISH COLUMBIA, CANADA.

AVIATORS LEVEL.

To all whom it may concern:

Be it known that I, ANDREW Monnis, a citizen of the Dominion of Canada, residing at Vancouver, in the Province of British (*olumbia. Canada, have invented certain new and useful Improvements in Aviators Levels, of which the following is a specitication. I

This invention relates to a level which is designed to'indicate to an aviator the iiiclination of his machine from the horizontal.

The invention is particularly describedin the following specification, reference being made to the drawings by which it is accompanied. in which:

Figure l is a side elevation of the level. and I Figs. 2 and 3 are enlarged details of the pivotal support of the plate and attachment of the level tube thereto.

Fig. is a cross section of a modified construction'of means 'for securing the tube to the outer ring.

The device comprises a flat ring or plate 2 which is graduated in degrees each way from the horizontal axis to ninety degrees; A glass tube 3 formed into a circle is se' cured on or in the plate 2 to be concentric with it and this tube is half ti'lled'with a mobile ll(}llltl such as alcohol or quicksilver.

'lhe plate 2 with its concentric tube 3 is sus-' pended between end centers 5 or on ball bearings to move freely about its'zero diameter within a. frame or stand 6.

The plate will by the pre )ond-ei'atiiig weight: of the fluid in the lower half of the tubular ring 3 maintain a substantially vertical position laterally and the tl iid will maintain its level in the tube as the plate 2 is inclined to any angle in a fore and aftline, and will thereby indicate to an aviator the angle at which his'machine is rising or To enable the reading ot'the dial to be madeat. night the surface of the plate 2 or Specification of Letters Patent.

Application filed May 31, 1918.

*atented Nov. 12, 1918. Serial No. 237,533.

its graduation marks should be painted with any suitable light emitting material and slllllltll'l) the liquid or the space in the tube may be rendered light emitting.

1n the drawing the tubular ring 3 is sllUWll as supported with its axis in the plane of the mid-thickness of the plate '2 by clips 4-. which is a simple and etfective way of securing the tube. and renders it available for reading the angle otl' either sideof the plate.

In Fig. l is shown a modified construction of means for securing the tube 3 to the outer ring portion of the plate 2. In this construction. the clip member is shown as riveted directly to the outer ring portion 2 and with this fol-mot securing means, the inner or center portion of the plate 2 may be entirely omitted. I

Having now particularly described my invention. I hereby declare that what I claim as new and desire to be protected in by Letters Patent. is:

1. An a viator's level. comprising a plate.

graduated in degrees from points diametrically opposite one the plate. means for plate at said and a tube bent to a circle concentric with the graduated plate ai'idsecured thereto with the axis of the tube in theapproxiniate plane of the plate. said tube being half filled with'a mobile liquid.

2. An aviators level. comprising a circular plate. means for freely suspending said freely pivoting said date from thefends of a diameter in a suitl able frame, said ring graduated in degrees from each point of suspension to the quarter circle. and a tube. bent to a circle concentric with the graduated plate to which it is secured in the plane of the mid-thickness of theplate.

in testimony whereof I atlix my signatur ANDREW MOR IS.

another in the plane 0f.

diametrically oppositepoint s, 

